Dial indicator



.1. G. SISSON DIAL INDICATOR Jan. 1, 1935.

Filed April 11, 1934 Devan/$01- James 6313.1 I Q I I I 4 9 I flttoz'zgql Patented Jan. 1, 15535 l l t .i IQU ED PATENT OFFICE I 1,986,540 a a H DIAL INDICATOR 51 James G. Sisson, Athol, Mass;- assignor to Th L. S. Starrett Company, Athol, Mass, a corporation of Massachusetts Application April 11 19 34,S erial 720,092

10 Claims. (Cl. 116-129) This invention relates to certain improvements whole internal mechanism is rigidly supported. in dial indicators and particularly those of the Those partsnotnecessary herein are not shown. adjustable dial type. These indicators have en- The tubule-r member or shell 1 which is of subjoyed a just popularity for more than ajquarter stantial;;-thickness is drilled. radially as at, 1 5 of a century and the present invention-"relates to througlrits wall structure, The bore 1% forms a 5 specific improvements thatbring these old indibearinglfor the locking screw 20 for whichdt is cators upto the requirements of late machinists tapped. This tapped bore issurrounded by a and manufacturers conditions. V t t counterbore 1 t k t I 1 The old type of such indicator was rather a The bezel ring 5 is rotatably mounted on the 10, crude. The advantage in shop practice, particuedge of the cylindrical casing l which it overlaps larly in connection with heavy work, made-it to intersect the counterbore 1 The bezel carnecessary that the dial indicator be soconceived, ries the usual transparent cover 6 and dial 7 designed and actually manufacturedthat it will referableto the pointer 8. The pointer actuating stand thevibration of machines speeded forprospindle is indicated at 9 and is guided in a lower l5 ductiont t bearing 10 and an upper bearing 11 covered bya 15 I In the typeof bezel lock shown herein the lockdust cap 12. 1 1:

ing pressure is radially outward. In the form The gage is used and the dial adjusted in the shown this offers several advantages as the lockusual manner in the measurement or checking ing pieces can be concealed or keptflush with the of work, but my construction providesfor a novel 2Q casingsurface- They also do not tend to wear the type of lock which is of practical assistance in outer or knurled surface of the bezel ring sothat these usual operations. t

1 it is not necessary to make it of hardmaterial and By reason of the rigidity of the casing and the the knurlings; can be as sharply facetedas desired, overhang of the bezel; 1am able to getstrong thus giving a firm grip to sweaty or oily fingers inradially outward acting lock structures ,in the stead of having to grip the entire bezel to get a gage which are of advantage in use and in manu- 25 turning hold I Specifically, applicant] provides facture. I v V for a direct radial pressure as distinguished from C O (if-t e b illustrated in F 2 consists locks in which the pressures are of multiple come of ascrew lockpiece 2 having & kn rled head ponentsdue t th l verages exerted. 21 below whichis an annular flange 22. The in- The structure shown in the drawing indicates her end is threaded as at 23 to engage the left 30 the improvements in the direction ofefiiciency in hand threads of the op g I When in unuse and economy in production. locked position the flange 22 fits flush or slightly In the drawing is shown as much of such a dial Within the counterbore 1 and so clears the in gage as is herein involved, and in the drawing: V side of the bezel ring w h is ee to turn.

Fig. 1 is a face view of a dial gage in accordance When the dial is set and it is desired to lock 35 ith my i ti it in any adjusted position, the knurled knob 21 Fi 2 ti on the1ine2 2of 1 nis turned to the right and the lock piece 20 is sequential interior parts being omitted. backed outwardly Upon this movement the Fig. 3 is a fragmentary view as seen from the j 22 engages the inner edge of the rings rear showing the bezellock applied at the usual Without marrmg any exposed; I have dust cap bearing and V ferred to the left hand screw 1n this structure as Fig 4 is an enlarged section on the 1m 8 of advantage. Most mechanics are used to turn 3, tion. of applicants lock to the dust capas a bezel by making the screw left handed. lockmg meansv I In the form shown in Figs. 3 and 4, the du In theform shown in Figs. 1 and 2, the general cap 12a common to this radial damp t is made type s own is that avin oppos te axial bearings with a surrounding flange 22 This is threaded for its spindle. In thesefigures the lock is dison the upper bearing 11 which is surrounded, as

it posed at one side of the casing with reference to shown in Fig. 4, by a countersunk recess or lock- 50 this bearing axis. I t way 11 The bezel ring 5 is locked or unlocked The casing 1 is preferably a substantial tububy simplyscrewing up on or unscrewing the dust lar member affording a rigid cylindrical shell to cap lock member 12. r

which is applied the back 2 and the front plate Thiscap member lock 12 and the cooperating 3. This plate 3 supports the bridged so that the thread of the upper external spindle guide 11 55 are preferably made left handed according to my concept to make practically possible the ready adoption and use by mechanics already habituatsaid lock piece disposed under the overhangof' the bezel ring and movable radially outward to contact the inner-surface of the bezel ring upon the unscrewing of the screw.

2. In a dial gage, a cylindrical ,casing threaded lock receiving recess therein, a. bezel mounted 'on one end of said casing and overlapping its outer surface, a bezel lock comprising a lock piece consisting of a threaded operating part for engagement with said casing, and a circular flange on saidlock piece disposed under the overhang of the bezel ring and movable radially outward to contact the inner surface of the bezel ring upon the unscrewing of the screw, said casing having an annular counterbore surrounding said threaded recess and adapted to receive the lock piece flange. 1

3. In a dial gage, a casing, a bezel rotatably mounted'thereon, and a rotatable locking piece consisting of a finger controlled head, a casing engaging shank and-a circular flange about said shank and having its edge underlying said bezel, said shank and ca'sing having a threaded engagement disposed and eiiective exclusively radially outward to clamp the bezel.

'4. In a dial gage,- a casing, a bezel rotatably mounted thereon, and a rotatable locking piece consisting of a finger controlled head, a casing engaging shank and a circular flange about said shank and having its edge underlying said bezel, said shank and casing having a threaded engagement and said casing being recessed in a position to receive the lock flange.

5. In a dial gage, a casing a bezel rotatably mounted thereon, and a rotatable locking piece consisting of a finger controlled head, a casing engaging shank and a circular flange about said shank and having its edge underlying said bezel, said shank and easing having a left hand thread overlapping 'saidflange, whereby said flange may be radially contacted with "theinnensurface of the bezel to lock it by rotation of the lock-piece.

7. In a dial gage, a cylindrical casing having diametrically disposed spindle bearings projecting therefrom, said casing having a lockway, a dust 'cap threaded on one of said bearings, a circular flange on said cap disposed in said lockway beneath theouter surface of said casing, a bezel rotatably mounted on one end of said casing and overlapping its outer surface and a portion of said flange, whereby said cap flange may be radially contacted with the inner surface of the bezel to lock it by rotation of the dust cap.

8. In a dial gage, a cylindrical casing having diametrically disposed spindle bearings projecting therefrom, said casing having an annular lockway surrounding one of said bearings, a dust cap threaded on one of said bearings, a circular flange on said cap disposed in said lockway beneath the outer surface of said casing, a bezel rotatably mounted on one end of said casing and overlapping its outer surface and a portion of said flange, whereby said cap flange may radially contact with the inner surface of the bezel to lock it by rotation of the dust cap.

9. In a dial gage, a-cylindrical casing, a bezel mounted on one end of said casing and overlapping its outer surface, a bezel lock comprising a lock-piece having a threaded portion in engagement withsai'd casing, and an annular flange on said lock-piece disposed under the overlap of the bezel and movable radially outward to contact the inner surface of the bezel upon unscrewing of the threaded lock-piece.

10. In a dial indicator, a casing having a spindle bearing projecting therefrom, a bezel rotatably mounted on one-endof the casing, a lock-piece threaded on said bearing and :having a portion engaging the bezel internally'and movable with the lock-piece to stress the bezel exclusively radially outwardly and diametrically in the lineof the bearing.

' JAMES G. SISSON. 

